A force F=4i^−3j^+5k^N is applied at the point P(2m,−1m,3m) whose position vector with respect to the origin O is r=2i^−j^+3k^m.
(i) Write the expression for the moment of this force about the origin.
(ii) Determine the torque vector and its magnitude.
(iii) State the unit vector along the direction of this torque.